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200 Kilovolts VS Amethyst

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LAN_403

HV Enthusiast

Thu Aug 02 2012, 12:55AM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
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I would put a a pretty high resistance in series. Not sure what your charge source is or what charge times you really want, but on the commercial max generators i've worked with, they generally used 1-10Meg series resistors for this purpose. We also use similar sized resistors when hi-potting large high voltage equipment.

Oneironaut

Thu Aug 02 2012, 03:09AM

Registered Member #3616 Joined: Fri Jan 14 2011, 08:47PM
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EasternVoltageResearch wrote ...

I would put a a pretty high resistance in series. Not sure what your charge source is or what charge times you really want, but on the commercial max generators i've worked with, they generally used 1-10Meg series resistors for this purpose. We also use similar sized resistors when hi-potting large high voltage equipment.

That's a high resistance value. Looks like another DIY project as finding a resistor capable will be difficult. Maybe a 12 inch plastic tube filled with water and a set of bolts threaded into each end to seal the unit? That should have a meg or 2 of resistance and take the abuse.

What do you think about this as a charge resistor?...

Thanks,
Brad

2Spoons

Thu Aug 02 2012, 06:01AM

Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
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I'd be a bit wary of using a film resistor. When I was working with electric fencing I found film resistors were OK until there was any kind of arc in series with them - at which point they'd blow a hole in the side. Something to do with fast voltage transients I'm guessing. I'd go with the water resistor - its cheap and easy to replace and customise.

Oneironaut

Thu Aug 02 2012, 01:40PM

Registered Member #3616 Joined: Fri Jan 14 2011, 08:47PM
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While thinking about making a pair of charging resistors (water filled tubes), it came to mind that these definitely need to be on the transformer side of the diode. If the water resistor saw any DC current, hydrogen bubbles would probably form in the sealed tube... not a good thing with so much corona around!

Brad

jake3085

Thu Aug 02 2012, 01:48PM

Registered Member #4800 Joined: Wed May 09 2012, 04:23AM
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wow this looks great :) you have put a lot of work into this :) do you have any videos of this? and do you have a youtube channel if so ill sub ya:)

take care and be safe:)

my youtube ->https://www.youtube.com/user/jake3085? feature=mhee

HV Enthusiast

Thu Aug 02 2012, 01:51PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
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Oneironaut,

I have some resistors which will fit the bill if you're interested. Free of charge but they are big so i'd ask you to pay only the shipping.

Steve Conner

Thu Aug 02 2012, 02:02PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Oneironaut wrote ...

While thinking about making a pair of charging resistors (water filled tubes), it came to mind that these definitely need to be on the transformer side of the diode. If the water resistor saw any DC current, hydrogen bubbles would probably form in the sealed tube... not a good thing with so much corona around!

Brad

The diode is in series with the transformer winding. It's a series circuit, so if DC flows in one part of it, DC must flow in all of it. Halfwave rectifiers normally aren't used with transformers for this reason: the DC saturates the core. But your transformer is so overkill for the job that it probably won't be bothered.

As to the resistance value, anything above roughly 1k should work, as it just has to damp RF oscillations.

Microwatt

Fri Aug 03 2012, 04:07PM

Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
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you know it looks like you hit it with a sledge hammer. y

Tetris

Fri Aug 03 2012, 06:34PM

Registered Member #4016 Joined: Thu Jul 21 2011, 01:52AM
Location: Gainesville, FL
Posts: 660

Amethysts are so pretty. You should have found a way to just cleave it, not burst it into a trillion pieces! And where did you get the amethyst anyways?

Oneironaut

Fri Aug 03 2012, 10:21PM

Registered Member #3616 Joined: Fri Jan 14 2011, 08:47PM
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HighVoltageChick wrote ...

Amethysts are so pretty. You should have found a way to just cleave it, not burst it into a trillion pieces! And where did you get the amethyst anyways?

I can't really get into much detail on the specifics, but the client will be happy with the results.
In my last version (much uglier design), I removed diamonds and kiberlite from solid rock core (video here)...

This version was pumped by a 14.4kv pole transformer and had some case arcing problems.
I am hoping to find funding to purchase 5 new Maxwell pulse caps and make a version that can be used to process tons of sample.

Brad

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